Re: [steghide-devel] Using Steghide

[Stefan H. <sh...@ch...>]

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On Sunday 27 April 2003 07:55, Adam Brickman wrote:
> I am terribly sorry to bother you again. I have one more question:
> First, I encrypt a wav file using steghide.  Then, I use my favorite
> sound editing program (Sound Forge) to add a little bit of noise to the
> file, or distortion, or any number of effects.
> However, after modifying the wav file, I cannot get steghide to run. I
> either get the error that the mask saved in the stego header is unknown
> <file corruption ?> or is not the default. The wav file will play in
> EVERY other program I have (Sound Forge, sound recorder, winamp, and
> more). How can I get steghide to recognize that this is a valid file. I
> expect it to produce errors on the decoded message output, but at least
> to give it a try!
Steghide is a steganography program, not a watermarking program and as such=
=20
not designed to be resistent against attempts to remove the embedded data=20
(e.g. adding noise, applying effects,...). The wav file plays in all sound=
=20
programs as it is a perfectly valid wav file, but after applying some effec=
ts=20
to a stego file it is no longer a valid stego file - steghide tries to=20
extract the data but fails (that's what those "file corruption?" errors=20
mean).

Greetings,
Stefan Hetzl
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